Features of SRP Tapes against CFRP Composites Used for Strengthening of Concrete Structures

• Published in: Procedia engineering Vol. 193; pp. 289 - 296
• Main Authors: Krzywoń, Rafał, Górski, Marcin, Dawczyński, Szymon
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2017
• Subjects: SRP composites; strengthening of structures; SRP composites; strengthening of structures
• ISSN: 1877-7058; 1877-7058
• DOI: 10.1016/j.proeng.2017.06.216

SRP (Steel Reinforced Polymer) tapes used as a reinforcement of externally bonded composite strengthening are representing a relatively new material, competitive to popular organic fibers. SRP tapes are based on ultra-high strength steel wires formed in cords and assembled into a fabric. Through advanced treatment, the mechanical properties of SRP steel are similar to other high carbon cold drawn steels used in construction (for example prestressing steel): strength exceed 2000MPa, there is no perfect plasticity at yield stress level. Almost linear stress-strain relationship makes SRP steel competitive to carbon fibers. Also flexibility and weight ratio of the composite overlay is a little worse than FRP strip. The paper shows results of the laboratory test of beams strengthened with SRP and CFRP laminates. Features of both materials were compared in the aspects of mechanical properties, strengthening effectiveness, delamination, longitudinal behavior, application process and shaping easiness. The greatest noticed advantage of SRP composites is better bond performance which has a beneficial effect on strengthening efficiency. Improved ductility ensure better cooperation with the concrete surface and thus increase the delamination strain and limits probability of brittle rupture. Among the disadvantages there can be found greater weight and limited assortment of appropriate adhesives on the market, nevertheless SRP composites represent interesting alternative for the most popular carbon fibre strips and sheets.